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United States Patent | 5,659,292 |
Tice | August 19, 1997 |
Outputs from a smoke detector and non-fire sensors such as temperature and humidity can be combined to produce a delay in a signal from the smoke sensor indicative of a potential fire condition. The signals can be combined locally and all of the sensors can be carried in a single housing. Alternately, the sensors can be carried in separate housings and combined at a remote control panel. The value output from the humidity and temperature sensor can be used in determining whether or not to produce a delay. Alternately, the rate of change of either or both parameters can be used to determine whether a delay is necessary.
Inventors: | Tice; Lee D. (Bartlett, IL) |
Assignee: | Pittway Corporation (Chicago, IL) |
Appl. No.: | 391208 |
Filed: | February 21, 1995 |
Current U.S. Class: | 340/522; 340/286.05; 340/293; 340/506; 340/517; 340/523; 340/577 |
Intern'l Class: | G08B 019/00 |
Field of Search: | 340/506,517,577,521,522,523,526,527,532,825.06,825.16,293,286.05 |
4536747 | Aug., 1985 | Jensen | 340/502. |
4611197 | Sep., 1986 | Sansky | 340/522. |
4660024 | Apr., 1987 | McMaster | 340/506. |
4725820 | Feb., 1988 | Kimura | 340/522. |
4749985 | Jun., 1988 | Corsberg | 340/523. |
4831361 | May., 1989 | Kimura | 340/506. |
5486811 | Jan., 1996 | Wehrle et al. | 340/522. |
Foreign Patent Documents | |||
A-396767 | Nov., 1990 | EP. | |
A-654770 | May., 1995 | EP. | |
A-418411 | Mar., 1991 | DE. | |
A-4127004 | Feb., 1993 | DE. | |
2206433 | Jan., 1989 | GB. |
Von Dr. Gustav Pfister Mannedorf; Fehlalarme in der Branddetektion: Dank neuer Technologie bald vom Tisch?; Marz 94; pp. 37-42. Dipl.-Ing. Michael Buschmann; Intelligentes Trio; 14 Oktober 1994; p. 408. |